From 1914 to 1918, the German Empire was at war with Britain, her colonies, France and other countries in the First World War. German soldiers from 1917 were abducted by aliens and unwittingly took part in the War Games, as well as British troops. At least one German soldier joined the resistance movement made up of people who had broken free of the War Lords' hypnosis. (TV: The War Games)

During World War II, when it appeared that the United Kingdom would be invaded by Nazi Germany, four citadels were built under the surface of London. They were intended to allow the British government to continue operations if the worst happened. After the war, the citadels were maintained due to the threat posed by the Soviet Union in the Cold War. (AUDIO: The Fifth Citadel)

In an alternate timeline in which the Eleventh Doctor never found the Dalek Ironsides, they became fully operational, with the Battle of Britain lasting only one more week before the German Luftwaffe suffered crippling casualties, forcing them to retreat and turn their forces against the Soviet Union. Their underestimation of the strategic possibilities of the Ironsides cost them dearly; whilst their efforts were diverted elsewhere, the Ironsides landed on the Normandy beaches, travelling along the seabed of the English Channel to avoid detection. The original two Ironsides were joined by the third Dalek from the ship.

The conflict was brief and soon the three Ironsides were marching across France, clearing a path for the liberation of the towns along their way by British soldiers. The enemy's guns were unable to penetrate the Ironside's defences and their speed and mobility meant that the Nazis were forced to retreat back to Germany to prepare a final defence, allowing the Russians to spread across Eastern Europe at the other end of the allied pincer movement. Up until this moment, the United States of America had remained strangely silent, unwilling to commit forces to war that seemed impossible to win, instead steadily stockpiling their weapons until a tactically advantageous moment arose. But when the Japanese attempted to come to Germany's aid with a pre-emptive attack on Pearl Harbor, the Ironsides stepped in, taking on the enemy bombers in a vicious dogfight lasting two days. The American Navy was saved and President Harry S Truman bestowed the Ironsides with a medal of honour, finally agreeing to aid the British in the war effort. Two months later, the allied forces marched on Berlin, and the Nazi stranglehold was broken. (DWAN: Doctor Who The Official Annual 2011)